Title :
Analysis and quantization procedures for a real-time implementation of a 4.8 kb/s CELP coder
Author :
Casajús-Quirós, F.J. ; Hernández-Gómez, L.A. ; Garcia-Mateo, Carmen
Author_Institution :
ETSI Telecomunicacion-UPM, Madrid, Spain
Abstract :
The main results from work on analysis techniques and quantization procedures for real-time implementation of the Proposed Federal Standard 1016 4800-b/s voice coder developed by the US DoD and AT&T Bell Laboratories are presented. Reduced search procedures are described for the adaptive and stochastic codebooks, two basic functions in code-excited linear predictive coders (CELPs), where great computational effort is required. An efficient procedure for the joint computation and quantization of the line spectrum pair (LSP) is also proposed. Details about a preliminary real-time implementation on a commercial board with a single DSP32C processor are described
Keywords :
analogue-digital conversion; code standards; decoding; encoding; filtering and prediction theory; speech analysis and processing; vocoders; 4.8 kbit/s; CELP coder; DSP32C; Proposed Federal Standard 1016 4800-b/s voice coder; adaptive codebooks; code-excited linear predictive coders; line spectrum pair; quantization; real-time; speech processing; stochastic codebooks; Autocorrelation; Code standards; Convolution; Delay; Filtering; Interpolation; Nonlinear filters; Quantization; Speech analysis; Speech coding; Standards development; Stochastic processes;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1990. ICASSP-90., 1990 International Conference on
Conference_Location :
Albuquerque, NM
DOI :
10.1109/ICASSP.1990.115786
